Dependence of Optical Properties of Two-Layered Metal- Dielectric Spherical Nanoparticles on Temperature

Abstract

The dependences of the efficiency factors of radiation absorption by spherical hybrid nanoparticles  of the core-shell system, respectively, with gold-quartz and quartz-gold materials with core radii r₀ = 40, 50, 60, 70 nm and shell thicknesses Δr₁ = 10, 20, 30 nm in the wavelength range of 300–3000 nm at temperatures of particles and surrounding quartz T = 300, 1173 K are theoretically calculated and studied. Essential change of radiation absorption by a nanoparticle is established with an increase of temperatures of nanoparticles and environment. The change of optical properties of nanoparticles significantly influences the efficiency of energy absorption of solar or optical radiation by nanoparticles, heating temperature of nanoparticles and environment and further thermal processes. The results are interesting for purposes of creation of high-temperature solid nanostructured absorbers of solar radiation containing absorbing radiation  of a nanoparticle and also for creation of new materials for high-temperature nanophotonics.